PowerShell Requires Chilkat v11.7.0+

PDF Object Streams: generate, preserve or disable

See more PDF Optimization Examples

Demonstrates the objectStreams option. An object stream packs many small objects (dictionaries, not stream data) into one compressed stream, which is usually a worthwhile saving in a document with many pages or tags. "generate" (the default) packs them and writes a cross-reference stream; "preserve" keeps the file as it is -- packed if it already was, not packed if it was not; "disable" writes every object on its own with a classic cross-reference table, which is what a PDF 1.4 reader needs. Object streams require PDF 1.5 and are skipped for PDF/A-1. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  The PDF used in this example is available at grand_canyon_hiking_guide.pdf

$fac = New-Object Chilkat.FileAccess
$json = New-Object Chilkat.JsonObject
$jsonOut = New-Object Chilkat.JsonObject

#  generate: pack the objects (the default).
$pdf1 = New-Object Chilkat.Pdf
$success = $pdf1.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf")
if ($success -eq $false) {
    $($pdf1.LastErrorText)
    exit
}

$json.UpdateString("objectStreams","generate")
$success = $pdf1.Optimize("optimize",$json,$jsonOut)
if ($success -eq $false) {
    $($pdf1.LastErrorText)
    exit
}

$success = $pdf1.WriteFile("qa_output/grand_canyon_objstm_generate.pdf")
if ($success -eq $false) {
    $($pdf1.LastErrorText)
    exit
}

$("generate: " + $fac.FileSize("qa_output/grand_canyon_objstm_generate.pdf") + " bytes, objects packed: " + $jsonOut.IntOf("actions.objectStreams.count"))

#  disable: every object on its own, with a classic cross-reference table.
$pdf2 = New-Object Chilkat.Pdf
$success = $pdf2.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf")
if ($success -eq $false) {
    $($pdf2.LastErrorText)
    exit
}

$json.UpdateString("objectStreams","disable")
$success = $pdf2.Optimize("optimize",$json,$jsonOut)
if ($success -eq $false) {
    $($pdf2.LastErrorText)
    exit
}

$success = $pdf2.WriteFile("qa_output/grand_canyon_objstm_disable.pdf")
if ($success -eq $false) {
    $($pdf2.LastErrorText)
    exit
}

$("disable:  " + $fac.FileSize("qa_output/grand_canyon_objstm_disable.pdf") + " bytes")

#  preserve: leave the file's own structure alone.  Use it when the output must stay readable by
#  whatever reads the input today.
$pdf3 = New-Object Chilkat.Pdf
$success = $pdf3.LoadFile("qa_data/pdf/grand_canyon_hiking_guide.pdf")
if ($success -eq $false) {
    $($pdf3.LastErrorText)
    exit
}

$json.UpdateString("objectStreams","preserve")
$success = $pdf3.Optimize("optimize",$json,$jsonOut)
if ($success -eq $false) {
    $($pdf3.LastErrorText)
    exit
}

$success = $pdf3.WriteFile("qa_output/grand_canyon_objstm_preserve.pdf")
if ($success -eq $false) {
    $($pdf3.LastErrorText)
    exit
}

$("preserve: " + $fac.FileSize("qa_output/grand_canyon_objstm_preserve.pdf") + " bytes")